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bfd/mmo.c: handle "objcopy --extract-symbols" generating and reading back. 

bfd:
	* mmo.c (struct mmo_data_struct): New members
	symbol_consistency_override_calculated and ignore_symbol_consistency.
	(mmo_section_has_contents, mmo_ignore_symbol_consistency): New
	functions.
	(mmo_create_symbol): Check with mmo_ignore_symbol_consistency if to
	report an error for unexpected value of Main.
	(mmo_write_symbols_and_terminator): Similar.
This commit is contained in:
Hans-Peter Nilsson 2015-10-22 09:32:30 +02:00
parent 282b7d7b65
commit c287bfe429
2 changed files with 51 additions and 3 deletions
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10
bfd/ChangeLog
View File

@ -1,3 +1,13 @@
2015-10-22 Hans-Peter Nilsson <hp@bitrange.com>
* mmo.c (struct mmo_data_struct): New members
symbol_consistency_override_calculated and ignore_symbol_consistency.
(mmo_section_has_contents, mmo_ignore_symbol_consistency): New
functions.
(mmo_create_symbol): Check with mmo_ignore_symbol_consistency if to
report an error for unexpected value of Main.
(mmo_write_symbols_and_terminator): Similar.
2015-10-22 H.J. Lu <hongjiu.lu@intel.com>
* elf32-i386.c (elf_i386_convert_load): Use call_nop_byte and

44
bfd/mmo.c
View File

@ -330,6 +330,14 @@ struct mmo_data_struct
/* We also need a buffer to hold the bytes we count reading or writing. */
bfd_byte buf[4];
/* Whether we've calculated symbol consistency requirement yet. We do this
when-needed, which must be at some time after all section
contents is known. */
bfd_boolean symbol_consistency_override_calculated;
/* Whether to consistency-check symbol values, in particular "Main". */
bfd_boolean ignore_symbol_consistency;
};
typedef struct mmo_data_struct tdata_type;
@ -585,6 +593,34 @@ mmo_mkobject (bfd *abfd)
return TRUE;
}
static bfd_boolean
mmo_section_has_contents (bfd *abfd ATTRIBUTE_UNUSED, asection *sec, void *p ATTRIBUTE_UNUSED)
{
/* The point is to match what --extract-symbols does (well, negated). */
return bfd_get_section_size (sec) != 0;
}
/* Find out whether we should omit symbol consistency checks for this
bfd and cache the value.
This function must only be called when all section contents is
known. However, calculating symbol consistency at the time the
private BFD data is initialized is too late for some uses. */
static bfd_boolean
mmo_ignore_symbol_consistency (bfd *abfd)
{
if (!abfd->tdata.mmo_data->symbol_consistency_override_calculated)
{
abfd->tdata.mmo_data->ignore_symbol_consistency =
bfd_sections_find_if (abfd, mmo_section_has_contents, NULL) == NULL;
abfd->tdata.mmo_data->symbol_consistency_override_calculated = TRUE;
}
return abfd->tdata.mmo_data->ignore_symbol_consistency;
}
static bfd_boolean
mmo_bfd_copy_private_bfd_data (bfd *ibfd, bfd *obfd)
{
@ -1208,7 +1244,8 @@ mmo_create_symbol (bfd *abfd, const char *symname, bfd_vma addr, enum
object. For written objects, we do it while setting the symbol
table. */
if (strcmp (symname, MMIX_START_SYMBOL_NAME) == 0
&& bfd_get_start_address (abfd) != addr)
&& bfd_get_start_address (abfd) != addr
&& !mmo_ignore_symbol_consistency (abfd))
{
(*_bfd_error_handler)
(_("%s: invalid mmo file: initialization value for $255 is not `Main'\n"),
@ -2900,13 +2937,14 @@ mmo_write_symbols_and_terminator (bfd *abfd)
= (mainsym->value
+ mainsym->section->output_section->vma
+ mainsym->section->output_offset);
memcpy (table + 1, orig_table, i * sizeof (asymbol *));
memcpy (table + 1, orig_table, i * sizeof (asymbol *));
table[0] = mainsym;
/* Check that the value assigned to :Main is the same as the entry
address. The default linker script asserts this. This is as
good a place as any to check this consistency. */
if (mainvalue != bfd_get_start_address (abfd))
if (mainvalue != bfd_get_start_address (abfd)
&& !mmo_ignore_symbol_consistency (abfd))
{
/* Arbitrary buffer to hold the printable representation of a
vma. */